The Dunn camera allows one to expose 35mm still or 16mm movie film to images displayed on a color monitor attached to a Dorado. The Dunn is usually configured with the 35mm camera. Other photographic accessories are kept in medium security storage. Please be careful when mounting or dismounting cameras. Always place lens caps on lenses as soon as practical, and put the cover over the hole in the top of the Dunn cabinet if there is a delay in mounting a camera. Please remember that all the photographic equipment in the installation is breakable or easily damaged.

The Dunn film camera views a high-resolution black and white monitor with a color filter-wheel between the monitor and camera lens. The internal monitor scans at a 1024 (wide) by 768 (high) pixel resolution. It will not scan correctly images sent at other resolutions.

Various software in the Cedar environment can produce pictures at varying resolutions; any image not at 1024 by 768 resolution, must be converted before being sent to the Dunn.

The Dunn camera is used principally in two ways. The first is to take pictures of 8 bit images displayed in black-and-white or psuedo-color. The second is to take pictures of 24 bit images displayed as a sequence of three black-and-white images.

Power on the Dunn. The 35mm camera should power on with the Dunn (a green LED should light); if it doesn't, use the switch located where the wind mechanism would normally be.

Verify the camera is loaded with film; this may be done by testing if the takeup reel spins freely (no film) or not (loaded). The film is loaded conventionally. Brian Tramontana (X4016) may be asked to provide and load film.

At the date of this writing, Ektachrome 200 is the preferred film (although 5247 may prove useful).

No focus adjustment should be made.

Unfortunately, a step wedge calibration to determine optimal f-stops for different film types has not been performed. F5.6 is suggested for Ektachrome 100; F11 for Ektachrome 200. F2.8 for Polarchrome (ASA 40). ``Bracketing'' the exposures is recommended.

Color calibration of the Dunn are not necessarily optimal; therefore do not expect precisely accurate colors.

An 8 bit image may be black-and-white, in which case black-and-white or color film may be used, or the image may be pseudo-color, in which case color film should be used. DunnSnap will automatically photograph a black-and-white image. The procedure may be manually performed with these steps:

24 bit images are real-color and color film should be used. Because the Dorado cannot display 1024 by 768 real-color images, the red, green, and blue components of the image must be separately exposed. DunnSnap will automatically photograph a 24 bit image. Or the image may be shot manually by following these steps:

Tools Needed

Equipment Needed:

Computer Items Needed:

The Bolex assembly should consist of a Bolex H16-M model camera, a cast metal bracket to hold it to the Dunn Camera housing, and a motor drive box with a cable attaching electrically to the Dunn camera. In its normal state, the assembly should be together and all the controls set properly.

Unnecessary Details About the Bolex Camera

To remove the 35mm camera, unplug the connector attached to the top of the Dunn. Use an allen wrench to remove two short bolts holding the 35mm camera bracket to the top of the Dunn Camera. Pull the entire 35mm assembly away from the Dunn (pull lens through rubber light-trap boot) and set aside. You will need one of the short allen bolts to attach the 16mm camera. Put the other one in a safe place.

Remove the lens cap from the Bolex.

(looking down on the top of the Dunn housing with the control panel facing you) The 35mm bracket is attached to the Dunn housing with two short allen head bolts. They go into the 2nd row of holes from the top. After these have been removed, you will notice a rubber gasket around the hole through which the lens looks at the monitor. On top of this hole, place the smaller rubber gasket, or boot, to seal light leaks around the smaller Bolex lens. Place the 16mm camera assembly on the Dunn housing with the top of the camera facing you, lens pointing down into the large hole. On the right of the Dunn housing are two screw holes. Align the lens with the lens hole and align the two holes in the Bolex bracket with the holes in the Dunn housing. Using one of the short allen head bolts that held the 35mm bracket and the long allen head bolt, screw the bracket down onto the Dunn housing, but do not tighten at this time. There should be enough play to enable you to move the Bolex from side to side to align the picture.

Also, don't connect the electrical connector from the motor box to the Dunn housing at this time.

This is perhaps the trickiest part of the mounting procedure. Remove the side cover from the Bolex. Inside the camera just behind the lens is a film pressure plate. It is black metal, about three inches long and consists of two strips of metal with two pins and a spring in between, and a thumb screw. Remove the film pressure plate assembly by unscrewing the hold-down thumb screw (the one toward the bottom of the camera), pulling on the spring-loaded pin (the one toward the top of the camera) and carefully wiggling the assembly until it comes out (it is held in the camera by a pin over which the hold-down thumb screw screw sits.)

(Note: no tools are necessary for the above step, so if a screw needs a screwdriver to turn, it's the wrong one.)

At this point, it will help to put an image on the Dunn Camera monitor. This can be done in your favorite way, or by running DunnView [Ivy]<MChow>Computer>Cedar>Thing.ip. Open the Dunn housing left side door (as you face the front panel) and turn the monitor switch from "Normal" to "Red" (or any of the RGB colors to unblank the monitor). Place the control panel "Normal/Focus" button to "Focus" and press "Expose" to move the opaque filter wheel segment to a clear segment. The filter wheel will close on you every 60 seconds, driving you to distraction.

If you attempt to look through the Bolex lens from the inside of the camera, you will notice the shutter area. The chances are good that the shutter is closed. You will need to open the shutter by manually advancing the film advance mechanism. This is done by turning the shaft of the motor drive where it attaches to the camera. (There is not a lot of room for people with fat fingers to do this). As you turn the shaft, you will notice the film sprockets turn, and soon the shutter will open (a rectangular opening will appear).

Now insert the focusing prism assembly over the same pin that held the pressure plate. It should slide on and sit nicely against the shutter. Watching the picture on the face of the prism, move the entire Bolex assembly until the picture is properly aligned. Now you can tighten the allen head bolts holding the assembly to the Dunn housing.

With the lens diaphragm open all the way (f/1.4), turn the focus ring until the image is sharpest on the prism face. Adjust the Horizontal and Vertical size pots to size the image according to the prism size.

Critical Thing to Note: Change switch G on the dip switch matrix to position 3 for 16mm operation. Cycle power to enable switches. For 35mm operation, return to position 1.

Remove the prism. Replace the film pressure plate. Load film. Set the correct f-stop on the lens. Connect the motor box connector to the Dunn housing socket. Reset all the Dunn knobs and switches to their original position (monitor switch to "Normal" and "Normal/Focus" to "Normal"). Take pictures.